The puncture wound is deep: Prof. Julius Gann has lost a lot of blood. When he and his wife returned home from a charity gala, an unknown attacker stabbed them in the villa. While help came too late for Carmen Gann, Prof. Gann is now being treated in his own private clinic - and even in this situation he remains the boss.

The geriatric nurse Sabrina Dobisch witnesses a traffic accident and bravely tries to save the life of the young pedestrian Christian van Meeren. She then accuses the driver Doris Ackermann of premeditated murder. While Sabrina is celebrated as a courageous rescuer and enjoys public attention, Inspector Borowski remains skeptical: Apart from the testimony, nothing indicates a capital crime. Until his colleague Sarah Brandt finds a gun in Doris Ackermann's glove compartment. Is there a connection between Christian van Meeren and Doris Ackermann? And what role does the piano teacher André Rosenthal play, who often spent time near the dead man?

Jürgen Sternow, head of the cyber crime department at the Kiel State Criminal Police Office, was the victim of a murder attack. It is reasonable to assume that the perpetrator is to be found in the area of rapidly growing cybercrime. Commissioners Borowski and Brandt are entrusted with the investigation by the responsible public prosecutor. While Borowski first has to acquire special technical knowledge, Sarah Brandt is in her element as a former hacker. But how do you hunt a perpetrator who has no relation to the victim and who knows all the tricks to hide in the Darknet?